WaIIy wrote:
On Mon, 7 Mar 2005 10:39:52 -0300, "Eike Lantzsch, ZP6CGE"
wrote:

The Mercury Sender is not an ordinary pot. It is wire wound.
It is not very accurate but accurate enough. You can't use carbon
pots in vehicles or boats.

The discs I replaced in my Alpha Ones sure looked like a round piece of
plastic with a carbon insert.

I could be wrong, but they weren't wire wound as far as I could tell.

There might be different types out there. I must say that I didn't
open the sensors but deducted "wire wound" from the "steppy"
characteristic of the resistance of the senders we installed. Ours
may be older - I don't know.
If the sensors are carbon and not conductive plastic or cermet then
I'm not surprized that the senders break. Wire wound would cost a few
cents more but they would never break.
Well - I saw bad engineering before - sigh ...

Then here is a warning: When cleaning carbon pots be very choosy
about the liquid you use. The wrong one (even contact cleaner) may
destroy the resistive part or the metal cover for the contacts.

Kind regards, Eike
--
Why postpone until tomorrow what you can avoid alltogether?